<template>
<div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>

    <el-steps 
    :active="active" 
    process-status="wait" 
    align-center 
    style="margin-bottom: 40px;">
        <el-step title="填写课程基本信息" />
        <el-step title="创建课程大纲" />
        <el-step title="最终发布" />
    </el-steps>

   <el-button type="primary" icon="el-icon-edit" @click="openChapterDialog">添加章节</el-button>

    <!-- 添加和修改章节表单 -->
    <el-dialog title="添加章节" :visible.sync="dialogChapterFormVisible">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题" :label-width="formLabelWidth">
                <el-input v-model="chapter.title" />
            </el-form-item>
            <el-form-item label="章节排序" :label-width="formLabelWidth">
                <el-input v-model="chapter.sort" :min="0" controls-position="right" />
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdateChapter">确 定</el-button>
        </div>
    </el-dialog>

     <!-- 添加和修改小节表单 -->
    <el-dialog title="添加小节" :visible.sync="dialogVideoFormVisible">
        <el-form :model="video" label-width="120px">
            <el-form-item label="课时标题" :label-width="formLabelWidth">
                <el-input v-model="video.title" />
            </el-form-item>
            <el-form-item label="课时排序" :label-width="formLabelWidth">
                <el-input v-model="video.sort" :min="0" controls-position="right" />
            </el-form-item>
            <el-form-item label="是否免费">
                <el-radio-group v-model="video.free">
                  <el-radio :label="true">免费</el-radio>
                  <el-radio :label="false">默认</el-radio>
                </el-radio-group>
            </el-form-item>
            <el-form-item label="上传视频">
                <!-- TODO -->
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 章节 -->
    <ul class="chapterList">
        <li v-for="chapter in chapterVideoList" 
        :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class="acts">
                    <el-button type="info" icon="el-icon-edit" @click="openVideoDialog(chapter.id)">添加小节</el-button>
                    <el-button type="info" icon="el-icon-edit" @click="openEditChapterDialog(chapter.id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" @click="deleteChapterById(chapter.id)">删除</el-button>
                </span>
            </p>
            <!-- 视频 -->
            <ul class="chapterList videoList">
                <li v-for="video in chapter.children" 
                :key="video.id">
                   <p>
                        {{ video.title }}
                        <span class="acts">
                            <el-button plain type="info" icon="el-icon-edit" @click="editVideo(video.id)">编辑</el-button>
                            <el-button plain type="danger" icon="el-icon-delete" @click="removeVideo(video.id)">删除</el-button>
                        </span> 
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <el-form label-width="120px">
      <el-form-item>
        <el-button type="warning" @click="previous">上一步</el-button>
        <el-button type="success" :disabled="saveBtnDisabled" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>
</div>
</template>

<script>
import chapter from "@/api/teacher/chapter"
import video from "@/api/teacher/video"
export default {
    data() {
        return {
            active:0,
            saveBtnDisabled:false,
            chapterVideoList:[],
            courseId:'',
            dialogChapterFormVisible:false,//章节弹框
            dialogVideoFormVisible:false,//小节弹框
            chapter:{
                title:'',
                sort:0
            },
            video:{
                title:'',
                sort:0,
                free:0,
                videoSourceId:''
            }
        };
    },
    created() {
        if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
        }
        this.getChapterVideo()
    },
    methods: {
        //==========================小节操作=====================================
        openVideoDialog(chapterId){
             this.$ref
             this.video = {}
             //设置章节ID
             this.video.chapterId = chapterId
        },
        editVideo(){
            this.dialogVideoFormVisible=true
            chapter.queryByChapterId(chapterId)
            .then(res => {
                this.video = res.data.video
            })
        },
        //删除小节
        removeVideo(videoId){
            this.$confirm('此操作将删除该小节，是否继续？','提示 ',{
                confirmButtonText:'确定',
                cancelButtonText:'取消',
                type:'warning'
            }).then(
                () => {
                    video.deleteByVideorId(videoId)
                    .then(res =>{
                        this.$message({
                            type:'success',
                            message:'删除小节成功!'
                        })
                        this.getChapterVideo()
                    })
                }
            )
        },
        //==========================章节操作=====================================
        //删除章节
        deleteChapterById(chapterId){
            this.$confirm('此操作将删除章节，是否继续？','提示 ',{
                confirmButtonText:'确定',
                cancelButtonText:'取消',
                type:'warning'
            }).then(
                    () =>{
                    chapter.deleteByChapterId(chapterId)
                    .then(res =>{
                        this.$message({
                            type:'success',
                            message:'删除章节成功!'
                        })
                        this.getChapterVideo()
                    })
                }
            )
        },
        //修改章节弹框数据回显
        openEditChapterDialog(chapterId){
             this.dialogChapterFormVisible=true
            chapter.queryByChapterId(chapterId)
            .then(res => {
                this.chapter = res.data.chapter
            })
        },
        //弹出添加章节页面
        openChapterDialog(){
            this.dialogChapterFormVisible=true
            // 清空内容
            this.chapter.title = ''
            this.chapter.sort = 0
        },
        addChapter(){
            //设置课程id到chapter对象里
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
            .then(res => {
                //关闭弹窗
                this.dialogChapterFormVisible = false
                //提示信息
                this.$message({
                    type:'success',
                    message:'添加章节成功!'
                })
                //刷新页面
                this.getChapterVideo()
            })
        },
        updateChapter(){
            chapter.updateChapter(this.chapter)
            .then(res => {
                //关闭弹窗
                this.dialogFormVisible = false
                //提示信息
                this.$message({
                    type:'success',
                    message:'修改章节成功!'
                })
                //刷新页面
                this.getChapterVideo()
            })
        },
        saveOrUpdateChapter(){
            if(!this.chapter.id){
                this.addChapter()
            }else{
                this.updateChapter()
            }
        },
         // 根据课程ID查询章节和小节
        getChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
            .then(res => {
                this.chapterVideoList = res.data.allChapterVideo
                console.log(this.chapterVideoList)
            })
        },
        previous(){
            this.$router.push({path: '/course/info/'+this.courseId})
        },
        next() {
            this.$router.push({path: '/course/publish/'+this.courseId})
        }
    }
}
</script>

<style scoped>
.chapterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chapterList li{
    position: relative;
}
.chapterList p{
    /*float: left;*/
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }

  .chapterList .acts {
    float: right;
    font-size: 14px;
  }

  .videoList {
    padding-left: 50px;
  }

  .videoList p {
    /*float: left;*/
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }
</style>